Download Organisation In The Body

Organisation In
The Body
Learning Objective:
How are cells organized into
tissues, organs, organ systems?
The body is
wonderful
thing…
But how do we
organise it?
Because we are
multicellular
organisms it’s
very complex.
What is the body
fundamentally made of?
?
Cells
We can study the
body at the
cellular level.
Cells is the first
level of
organisation.
Make your own cell:
Plastic bag, elastic band,
plasticene, water
Cells carry out their own “tasks”
to ensure that the body as a whole
continues to function
In multicellular organisms,
cells rarely work alone.
Cells that are similar in structure
and function are usually joined
together to form tissues.
Tissues is the second level of
organisation.
Make a tissue:
Place the plastic bags into the
dish
Tissues
There are four
basic/major types
of tissues in the
human body:
•
•
•
•
Epithelial tissue
Muscle tissue
Connective tissue
Nerve tissue
Epithelial Tissue
• Covers and lines body
surfaces, cavities and
ducts.
• Cells look regular,
geometric shaped with
obvious nuclei.
Muscle Tissue
• Tightens and
loosens itself to
move other
body parts
Connective Tissue
• Connects and
supports other
parts of the body.
• Blood, bone, fat
and cartilage are
all examples of
connective tissue.
Nerve Tissue
• Carries messages between the brain
and the body
When a group of different types
of tissues work together, they
form and organ.
Organs is the third level of
organisation.
Here, several different types of tissues have
separate jobs, but they all form one larger
structure – an organ.
What organs do you already
know?
Organs
Let’s look at the
human torso!
Just as cells act together in
tissues, and tissues act together
in organs, organs act together in
organ systems.
Organ systems is the fourth level
of organisation.
Organ Systems
• Organ system is a
group of organs
that work
together to
perform a major
function.
Organ Systems
Organ Systems
A and B=
Muscular and
Skeletal
systems
C= Nervous
system
D=
Endocrine
system
E=
Circulatory
system
Organ Systems
F=
Skin and hair
system
G= Lymph
system
H=
Respiratory
system
I= Digestive
system
Organ Systems
Excretory
system
Reproductive
system
All of the organ systems come
together to form an organism.
Organism is the fifth level of
organisation.
Let’s review:
1st Level: Cells working together form
2nd Level: Tissues, which can form
3rd Level: Organs, which work together
to form
4th Level: Organ Systems, which work
together to form
5th Level: Organisms!
There’s also one more level:
Scientists are learning about
how cells work by studying
the chemical reactions that
go on inside cells. This is
the job of biochemists.
They study the body at the
biochemical level.